21534976 has 18 divisors (see below), whose sum is σ = 42986342. Its totient is φ = 10767360.

The previous prime is 21534973. The next prime is 21534979. The reversal of 21534976 is 67943512.

It is an interprime number because it is at equal distance from previous prime (21534973) and next prime (21534979).

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 9144576 = 3520^2 + 3024^2 .

It is not an unprimeable number, because it can be changed into a prime (21534973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41805 + ... + 42316.

Almost surely, 2^21534976 is an apocalyptic number.

It is an amenable number.

21534976 is a deficient number, since it is larger than the sum of its proper divisors (21451366).

21534976 is an frugal number, since it uses more digits than its factorization.

21534976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84137 (or 84123 counting only the distinct ones).

The product of its digits is 45360, while the sum is 37.

The square root of 21534976 is about 4640.5792741855. The cubic root of 21534976 is about 278.2155910929.

The spelling of 21534976 in words is "twenty-one million, five hundred thirty-four thousand, nine hundred seventy-six".